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// Copyright 2014 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.rules.extra;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.CommandHelper;
import com.google.devtools.build.lib.analysis.ConfigurationMakeVariableContext;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.FilesToRunProvider;
import com.google.devtools.build.lib.analysis.MakeVariableExpander;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.Runfiles;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.packages.Type;
import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.syntax.Label;
import java.util.List;
/**
* Factory for 'extra_action'.
*/
public final class ExtraActionFactory implements RuleConfiguredTargetFactory {
@Override
public ConfiguredTarget create(RuleContext context) {
// This rule doesn't produce any output when listed as a build target.
// Only when used via the --experimental_action_listener flag,
// this rule instructs the build system to add additional outputs.
List<Artifact> resolvedData = Lists.newArrayList();
Iterable<FilesToRunProvider> tools =
context.getPrerequisites("tools", Mode.HOST, FilesToRunProvider.class);
CommandHelper commandHelper = new CommandHelper(
context, tools, ImmutableMap.<Label, Iterable<Artifact>>of());
resolvedData.addAll(context.getPrerequisiteArtifacts("data", Mode.DATA).list());
List<String>outputTemplates =
context.attributes().get("out_templates", Type.STRING_LIST);
String command = commandHelper.resolveCommandAndExpandLabels(false, true);
// This is a bit of a hack. We want to run the MakeVariableExpander first, so we expand $ on
// variables that are expanded below with $$, which gets reverted to $ by the
// MakeVariableExpander. This allows us to expand package-specific make variables in the
// package where the extra action is defined, and then later replace the owner-specific make
// variables when the extra action is instantiated.
command = command.replace("$(EXTRA_ACTION_FILE)", "$$(EXTRA_ACTION_FILE)");
command = command.replace("$(ACTION_ID)", "$$(ACTION_ID)");
command = command.replace("$(OWNER_LABEL_DIGEST)", "$$(OWNER_LABEL_DIGEST)");
command = command.replace("$(output ", "$$(output ");
try {
command = MakeVariableExpander.expand(
command, new ConfigurationMakeVariableContext(
context.getTarget().getPackage(), context.getConfiguration()));
} catch (MakeVariableExpander.ExpansionException e) {
context.ruleError(String.format("Unable to expand make variables: %s",
e.getMessage()));
}
boolean requiresActionOutput =
context.attributes().get("requires_action_output", Type.BOOLEAN);
ExtraActionSpec spec = new ExtraActionSpec(
commandHelper.getResolvedTools(),
commandHelper.getRemoteRunfileManifestMap(),
resolvedData,
outputTemplates,
command,
context.getLabel(),
requiresActionOutput);
return new RuleConfiguredTargetBuilder(context)
.addProvider(ExtraActionSpec.class, spec)
.add(RunfilesProvider.class, RunfilesProvider.simple(Runfiles.EMPTY))
.build();
}
}
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